Hi Jianhua,
When I am reaching the end of the long journey of my green card application, I would like to say "thank you so much" to you from the bottom of my heart. Thank you for the great service you provided and for the professional suggestions you gave in the process of my green card application. I really appreciate it. I would highly recommend you if I have any chance. Finally, I wish you a happy and fruitful year in 2018.
Regards,
Client
01/04/2018